Pen drive showing less space than actual

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What's wrong with the pen drive? How can I recover the lost space? Device Boot Start End Blocks Id System I/O size (minimum/optimal): 4096 bytes / 4096 bytes Sector size (logical/physical): 512 bytes / 4096 bytes

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Disk /dev/sdb: 0 MB, 512000 bytesĢ55 heads, 63 sectors/track, 0 cylinders, total 1000 sectors I am unable to create a new partition table or a partition on the pen drive now. When I open gparted it is showing the total space on the pen drive as 500 MB. Today, when I inserted the pen drive, the I am unable to write anything on to it. I used to write raw data into the pendrive (without creating filesystem) using the dd command.